ROSSELLO Wastewater Treatment Plant, Rosselló, Catalunya, Spain

The ROSSELO wastewater treatment plant is located in Rosselló, a municipality in the Segrià comarca of Catalunya, Spain. It serves a population of approximately 2,268 residents, classifying it as a small agglomeration under Spanish and EU regulations. The plant is situated inland, away from coastal areas, and its treated effluent is discharged into local watercourses. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. With a designed capacity of 4,000 m³/day and an average discharge volume of 851.6 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated wastewater is discharged into the local hydrological network, which ultimately drains into the Ebro River basin, one of the most important river systems in Spain. The Ebro River flows into the Mediterranean Sea, supporting diverse aquatic ecosystems and agricultural activities in the region. The plant's operation helps protect downstream water quality and contributes to the environmental health of the Ebro basin.

The ROSSELO plant discharges into the Segrià region's drainage network, which feeds into the Ebro River, the largest river in Spain by discharge volume. The Ebro River flows into the Mediterranean Sea via the Ebro Delta, an ecologically sensitive area that supports diverse birdlife and fish species. The plant's secondary treatment helps reduce organic pollution and nutrient loads, mitigating eutrophication risks in downstream waters.